Magento 1.9 – What is error in my Observer?

My Custom observer : app\etc\modules\Gta_FindPaymentGateway.xml <?xml version=”1.0″ encoding=”UTF-8″?> <config> <modules> <Gta_FindPaymentGateway> <active>true</active> <codePool>local</codePool> </Gta_FindPaymentGateway> </modules> </config> app\code\local\Gta\FindPaymentGateway\etc\config.xml <?xml version=”1.0″?> <config> <modules> <Gta_FindPaymentGateway> <version>1.0.0</version> </Gta_FindPaymentGateway> </modules> <global> <models> <gta_findpaymentgateway> <class>Gta_FindPaymentGateway_Model</class> </gta_findpaymentgateway> </models> <events> <checkout_cart_product_add_after> <observers> <Gta_FindPaymentGateway_Model_Observer> <type>singleton</type> <class>Gta_FindPaymentGateway_Model_Observer</class> <method>paymenter</method> </Gta_FindPaymentGateway_Model_Observer> </observers> </checkout_cart_product_add_after> </events> </global> </config> app\code\local\Gta\FindPaymentGateway\Model\Observer.php <?php class Gta_FindPaymentGateway_Model_Observer { public function paymenter($Observer) { $order =…